Meaning of the word "a clear conscience is a sure card" in English

What does "a clear conscience is a sure card" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

a clear conscience is a sure card

US /ə klɪr ˈkɑnʃəns ɪz ə ʃʊr kɑrd/
UK /ə klɪə ˈkɒnʃəns ɪz ə ʃɔː kɑːd/
"a clear conscience is a sure card" picture

Idiom

a proverb meaning that if you know you have done nothing wrong, you can face any situation with confidence and peace of mind

Example:
He wasn't afraid of the investigation because a clear conscience is a sure card.
Even when everyone doubted her, she remained calm, knowing that a clear conscience is a sure card.